Re: [Xen-users] BLKTAP under Debian Lenny - not working

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Feb 23, 2010 at 11:48:20AM +0100, Darko Petrovi? wrote:
>    Hi all,
> 
>    When I try to use tap:aio configuration I get the following error message
>    upon executing xm create:
>    Error: Failed to create device.
>        stdout: unrecognized child response
>        stderr:
>    Check that target "/dev/vg0/lvol0" exists and that blktap2 driver
>    installed in dom0.
> 
>    This is what I find in /var/log/syslog:
>    Feb 23 11:37:38 xen-1 tapdisk2[3523]: Created /dev/xen/blktap-2/blktap2
>    device
>    Feb 23 11:37:38 xen-1 tapdisk2[3523]: Created /dev/xen/blktap-2/tapdev2
>    device
>    Feb 23 11:37:38 xen-1 tapdisk2[3523]: new interface: ring: 252, device:
>    254, minor: 2
>    Feb 23 11:37:38 xen-1 tapdisk2[3523]: I/O queue driver: lio
>    Feb 23 11:37:38 xen-1 tapdisk2[3523]: Incorrect magic in shared info.
>    Feb 23 11:37:38 xen-1 tapdisk2[3523]: Failed to open shared info.
>    Feb 23 11:37:38 xen-1 kernel: [ 1002.545721] blktap_sysfs_create: adding
>    attributes for dev ec6f00c0
>    Feb 23 11:37:38 xen-1 kernel: [ 1002.545728] blktap_control_allocate_tap:
>    allocated tap c1ef8800
>    Feb 23 11:37:38 xen-1 kernel: [ 1002.547589] tapdisk2[3523]: segfault at
>    10 ip b758aa00 sp bfd07dd4 error 4 in [1]libpthread-2.7.so[b7583000+15000]
>    Feb 23 11:37:38 xen-1 logger: /etc/xen/scripts/xen-hotplug-cleanup:
>    XENBUS_PATH=backend/vkbd/4/0
>    Feb 23 11:37:38 xen-1 logger: /etc/xen/scripts/xen-hotplug-cleanup:
>    XENBUS_PATH=backend/vfb/4/0
> 
>    Here is also the corresponding part of my DomU configuration file:
>    disk = ['tap:aio:/dev/vg0/lvol0,xvda,w','tap:aio:/dev/vg0/swap,xvdb,w']
> 
>    The pv_ops dom0 kernel is compiled with CONFIG_XEN_BLKDEV_TAP=y. Both
>    lvol0 and swap do exist, I've double-checked it (namely, they work with
>    phy: instead of tap:aio).
>    What could be wrong?
> 

What's your pv_ops dom0 version? when did you check it out? 
Only the very recent (as of a couple of days ago) pv_ops dom0 
kernels have working blktap2.

-- Pasi


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